SD-10c-1966-01 Split Die

Description

First documented split die for the 1966 Roosevelt dime, SD-10c-1966-01 records a catastrophic die failure during the second year of copper-nickel clad dime production. Like 1965 and 1967, the 1966 dime carries no mintmark — a deliberate omission mandated by Congress to discourage the coin hoarding that had plagued the nation during the silver-to-clad transition. Without mintmarks, all 1966 dimes were struck at Philadelphia (with possible supplemental production at Denver and San Francisco), and the total production reached approximately 1.38 billion pieces. John R. Sinnock's Roosevelt dime design, adopted in 1946 to honor President Franklin D. Roosevelt's association with the March of Dimes charitable organization, provides the obverse portrait and the torch-with-branches reverse that form the canvas for this die failure. A split die occurs when a working die fractures along a plane that extends across its face, dividing the die into two or more sections that shift relative to each other under the force of striking. Coins produced from a split die display a visible seam or line across the surface, with design elements on either side potentially showing misalignment, height differences, or detail weakness along the fracture path. The clad composition introduced in 1965 may have contributed to unfamiliar stress distributions on dies during this early transition period, as the Mint adjusted its metallurgical and production practices to accommodate the new planchet material. Cataloged by Cuds on Coins with no known cross-references, SD-10c-1966-01 documents a terminal die failure from the mintmark-less transitional era. Collectors can identify split dies under low-angle illumination by looking for the linear disruption crossing the coin surface with raised or step-like transitions along the fracture boundary.

Attribution History

• Discovered by Fred Weinberg
• Expert attribution by Cuds on Coins

External References